Collapsible bed frame



FIG. 1 is a perspective view of the collapsible bed frame, showing the design thereof;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a left side elevational view thereof;

FIG. 8 is a another perspective view thereof, but showing one of the side rails in a detached position;

FIG. 9 is a perspective view of the detached side rail of FIG. 8, shown in an angled position, and shown separately for completeness of illustration; and,

FIG. 10 is a perspective view of the opposite side of the side rail of FIG. 9.

The broken lines in the drawings illustrate portions of the collapsible bed frame that form no part of the claimed design. 

CLAIM The ornamental design for a collapsible bed frame, as shown and described. 